.container{
	position: relative;
	width:800px;
	height:480px;
	margin:0 auto;
	background:#ccc;
	padding-top: 60px;
	padding-bottom: 20px;
	box-sizing:border-box;
	display: flex;
	justify-content: space-around;
}

.column{
	width:20px;
	background:rgb(100,100,100);
	border-top-left-radius: 10px;
	border-top-right-radius: 10px;

	display:flex;
	flex-direction: column-reverse;
	justify-content: flex-start;
	align-items: center;
}

.item{
	width:80px;
	height:20px;
	border:1px solid;
	background:#008c8c;
	border-radius: 10px;
}

.line{
	width:100%;
	height:20px;
	background:#000;
	position:absolute;
	bottom:0;
}



.btns{
	width:800px;
	margin: 0 auto;
	display: flex;
	justify-content: space-around;
	margin:30px auto;
}

.btns button{
	margin: 0 10px;
}